Extreme Weather and Infrastructure Risk

Honolulu officials issued a 5:35 a.m. emergency evacuation for more than 4,000 people downstream of the 120‑year‑old Wahiawa Dam after warning it was "at risk of imminent failure" and reporting water actively running over the spillway amid 8–12 inches of overnight rain and National Weather Service warnings of "widespread life‑threatening flash flooding" across Haleiwa and Waialua. Mud-churned floodwaters — described as chest‑high in parts of north Oahu — have blared sirens, swept homes and vehicles off foundations, forced shelter relocations (about 185 people and 50 pets were bused from a flooded school shelter), prompted searches by firefighters and lifeguards on jet skis, and led to activation of the Hawaii National Guard as some residents remain isolated.